Buttonhole sewing machine



Jan, l2, 1932. J. KlEwlcz BUTTONHOLE SEWING MACHINE Filed Sept. l, 1927 4 Sheets-Sheet h Klpvepor. do n lem/rc3 ATTys,

Jan. l2, 1932. J. KlEwlcz BUTTONHOLE SEWING MACHINE Filed Sept. l, 1927 v4 Sheets-Sheet 2 agm ATTys.

lnvenor. John Klewm by@ my 1311112, 1932. J, KlEwlCz 1,841,133

BUTTONHOLE SEWING MACHINE Filed Sept. l, 1927 4'Sheets-Sheet 3 Fgl.

Fig A 17 E lnvenor.

Z5 5| 27. 24 SS 64 6| 67 .as

@CITY s.

1,745.4@ MIM'.

Jan. 12, 1932. J. KlEwlcz 1,841l33 BUTTONHOLE SEWING MACHINE Filed Sept. l, 1927 4 Sheebs--Sheel 4 l 6o 58 Fig.

|nvenor. dohn Ki @wieg by/Mwdfm Patented Jan. 12, 1932 UNITED-STATES. PATENT orifice JOHN KlIEl/"ICZ,l OF BOSTON, MASSACHUSETTS, Asi-SIGNOR TO THE REEGE BUTTON HOLE MACHT-NE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE BUTTOHHOLE SEWING MACHINE Application led September 1, 1,927. Serial No. 216,868.

rllhis invention relates to buttonhole ysewin(T machines and has for its principal object to provide a buttonhole sewing machiney which is capable of cutting the buttonhole slit either before vor after the sewing opera-v tion.

ln sewing buttonhol-es in some kinds of cloth it is desirable to cut the slit before the buttonhole stitches are sewed while in other cloths it may be most desirable to cut the buttonhole slit after the stitching h as been comjjileted. Usually buttonhole sewing machines are constructed so that they will' cut y the slit only either before the sewing. operation or after the sewing operation and consequently in ordering a machine it is usual for the customer to specify whether thev machine isto be of the kind which will cut the slit before the sewing operation or of the kind which will cut the slit after the sewing operation.

My invention provides nov-el means by which a buttonhole sewing machine may be adjusted to cut the buttonhole either bef-ore er after the sewing operation and hence 'a machiner embodying my improvementsY 1S yadapted for sewing buttonholesy in the kind of work which requires the buttonhole slit to be cut before the sewing operation and also in the. kind of work which requires the buttonhole to be cut after the sewing operation.

In these buttonhole sewing machines the buttonhole cutter is usually actuated by a cam projection formed on the main cam of the machine which makes one complete rotation during each sewing cycle.

In carrying out my invention I` provide a construction by which the sewing machine may be brought to rest atthe end ofy each sewing cycle either just lbefore the cutting cam actuates the buttonhole cutter or just after it has actuated said cutter.. If the sewing. machine is brought to rest with the cut-V ting camV in the first position then when the machine is started again for sewing; the next buttonhole the cutting cam will actuate' t-he cutter before the sewing begins. Whileif the machine is stopped inthe second position just after the cam has. actuated the cutter then the cutting cam will have to make a substantially complete rotation before it comes intoposition to actuate the cutter and during-.this rotation the sewing on the buttonhole will have been completed, the cutting of the slit thus being done after the sewing operation.

ln order to give an understanding of my invention I have illustrated in the drawings a selected embodiment thereof which will now be described after which the novel features will be pointed out in the appended claims.

F ig. l is a side View of a sewing machine having my improvements applied thereto;

Fig. 2 is an under side view of the bed;

Fig. Sis a fragmentary detail View;

Figs. 4, 5 and 6 are fragmentary views showing the means for controlling the time of bringing the machine to rest at the end of each sewing cycle; Figs. 4 and 5 illustrating the parts in adjusted position for effecting the cutting of the buttonhole after the sewing operation has been completed while Fig. 6 shows the parts in position for effecting the cutting of the buttonhole before the sewing operation begins;

Figs. 7 and 8 are fragmentary views illustrating the different stopping positions of the main cam at the time the machine is brought to rest, F ig. 7 showing the stopping position when the buttonhole is cut after the sewing operation and F ig. 8 showing the stopping position when the buttonhole is cut before the sewing operation;

Figs. 9, 10, 1l and l2 are fragmentary views illustrating the operation of the stopcontrolling mechanism.

Fig. 13 is a fragmentary view of the stopping position of the main cam when the buttonhole is to be cut before the sewing operation.

In the drawings l indicates the bed portion of the sewing machine and 2 the frame which carries the stitch-forming mechanism, the latter comprising the usual needle 3 car;- ried by a needle bar 4 'which is mounted for vertical reciprocation in the overhanging arm 5 of the frame 2, and also comprising under thread handling mechanism which is i frame 2.

carried by a turret 6 situated beneath the bed frame and mounted to turn in suitable bearings 7 carried by the portion 8 of the The work is held in position on the bed 1 by usualpwork clamps 9, the latter being ilar to that illustrated in Patent No. 713,764,

i dated November 18, 1902. The clamp arm 10 is extended below the pivot 11 and is provided with a lip 12 adapted to engage a lip 13 on a swinging frame 14 which is pivoted to the bed at 15. This frame 14`has a bracket y arm 16 depending therefrom, tothe lower lend of which is pivoted one end of a toggle member 17, the latter having pivotal connection at 18 to the lower end of the co-operating toggle member 19 which is pivoted to the bed 1 at 20. The bracket arm 16 is acted on by a spring 21 which normally holds the toggle 17, 19 in broken position as shown in Fig. 1. `When the toggle is straightened the bracket arm 16 will be forced downwardly since the upper pivot of the toggle is stationary in the bed frame 1. Such downward movement of the bracket arm 16 will swing the armV 14 downwardly and thus cause the f lip 13 to engage the lip 12, this resulting in closing the work clamps.

The .straightening of the toggle member 17, 19 is secured in usual way from the main cam 22 of the machine which is mounted in the cam housing 23 that is rigid with theV frame 2. Thisv cam housing has a lever arm 24 pivoted thereto at 25, the front end of ly and causing it to act against the arm 26 thereby straightening the toggle all as shown in the above-mentioned patent.

lThe button hole cutter is shown at 280 and it is carried by a cutter arm 29 pivoted to the frame 2 at 30 and said cutter is given its cutting movement by a cam projection 31 formed on the top of the main cam 22, said projection being adapted to engage the-tail 32 of the cutter arm as the cam rotates. The cutter is normally held in its raised position by a spring 33.

The main cam 22 is rotated from a drive shaft 34, the latter having spiral gear teeth 35 thereon that mesh with (3o-operating gear teeth on the periphery of the cam as usual. When thesewing machine is first started by depression of the starting lever 36 the shaft 34 is automatically coupled to a driving pulley 37 and the cam 22 derives its initial turning movement from the driving "pulley 37 .Y

During this initial movement the parts are brought from starting position shown in full lines Fig. 1 to stitching position shown in dotted lines and it is during this initial movement of the cam 22 that the clamps are closed.

W' hen the stitching position has been reached the stitch-forming mechanism is set in operation and the pulley 37 is automatically disengaged froni the shaft 34, the cam 22 thereafter being turned by means actuated by the driving shaft for the stitch-forming mechanism all-as usual in sewing machines of this final movement of the main cam 22 is derived from the pulley 37.

The means controlling the operation of clutching the pulley 37 to and unclutching it from the shaft 34 is similar to that illustrated in Patent No. 655,637, August 7, 1900. The pulley 37 is slidably mounted on the shaft 34 and is provided with a clutch dog 40 adapted to engage a co-operating dog 41 on an arm 42 rigid with the shaft 34. The movement of the pulley longitudinally of the shaft is controlled by a clutch-controlling lever 43 which is pivoted to the cam casing at 44 and is provided with a forked portion 45 engaging in a groove in a hub 46 of the pulley 37. This controlling lever 43 is acted on by a spring 47 which normally tends to move the pulley into its clutching engagement with the shaft.

The pulley is held in itsy unclutched condition shown in Fig. 2 by a lever 48 which is pivoted at 49 to the bed 1, said lever having a pinv50 at one end which engages the lever 43 and being normally held in the position shown in Fig. 2 by the lower end 59 of the starting lever 36. l When the starting lever is depressed the lower end thereof is disengaged from the lever 48 and as the latter is released the spring 47 will operate toshift the pulley 37 into clutching engagement with the' shaft 34.

The partsthus far described are or may be all as usual in devices of this sort and as shown in the various patents-above referred to and form no part lof the present invention, which as stated above relates to a construction by which the buttonhole cutter may be operated either before or after the sewing operation. This end is accomplished by means which controls the stopping position of the main cam 22. Ifthe buttonhole slit is to be cutl before the sewing operation then this cam 22 will be stopped with the cutting cam 31'having therelative position to thetail 32. of. the cutting levershown in Fig. 13 while ifv the buttonhole slit is to be cut after the sewing operation the stopping'position of the cam will be that shown in full. lines in Fig. 1.

Assuming that the parts are adjusted so that theV stopping position of the cam is as shown in Fig. 13 and that the cam has the direction of rotation indicated by the arrow it will be apparent that as the cam 22 startsto rotate the cutting cam 31 will act against the tail 32 during the initial movement of the cam and thus before the stitch-forming mechanism is set in operation. :This will result in cut-ting the buttonhole slit before the stitch ing is begun. On the otherhand, if the stopping position of the main cam is that shown in full lines in Fig. 1 thenwhen the cam starts in operationv the cutting cam 31 will move away from the tail 32 thus leaving the cutter280`idle and said cutting cam 31 will not `be' brought into position to actuate the cutteruntil the main cam 22 has nearly completed its revolution. With this adjustment ofv parts it is obvious that the cutting of the buttonhole slit will occur after the stitching has been completed. l

The -mechanism employed for effecting a cutting of the buttonhole before the stitching vis began is similar to that shown in the abovementioned Patent No. 713,764.

As'stated above if the buttonhole is to he cut before the stitching operation the stoppingposit'ion of the cam 22 will be that shown in Fig. 13 and the cutting cam 31 will occupy a position directly `in front of the tail 32. position indicated by dotted lines in Fig. 1., Wien the machine started the cam depresses the arm 24, straightens the toggle 17, 19 and closes the clamps as above described and immediately thereafter the cuttingl cam v31 acts on the tail 32 of the lever 29 actuates the buttonhole cutter 280. As soon as the cam 28 has passed the roll 27 the lever arm 24 will be raised by the spri g 51. the roll 27 at this time` resting against a cam track 52 on the cam 22. During the sewing on the first side of the buttonhole the frame 2 is moving to the left Fig. 1 and the sewing on the second side of the buttonholel progresses theframe 2 moves to the right and during this movement the end 53 of the lever arm 24 engages the lug 54 of the togglel member 17 as shown by dotted lines Fig. G and during further movement of the frame 2 and arm 24 the toggle will be broken thus un# clamping the work.

The breaking of the toggle accompanied by the disconnecting vof the pulley 37 from the shaft 34, thus bringing the machine to rest. Todo this I have provided a finger 55 pivoted at 56 to a lug on the end of the lever 48, the end of said finger resting on the central joint of the toggle 17, 19 and being etainedf fromlateral movement by a guard flange 57. B reason of this construction the finger 55 wil have an up and down swinging movement as the toggle 17, 19 is broken or straightened. The straightening of the toggle lever obviously lowers the central pivot y thereof and at the same time swings said central pivot to the left Figs. 1, 4, 5, and 6. The linger 55 is curved slightly sothat this swinging of theccntral pivot of the togglo lever to the left allows the finger 55 to move downwardly from the position shown in Fig. 1 to that shown in Fig. 4. On the other hand, the breaking ofthe toggle causes the finger to be. elevated. This finger. 55 is provided with an upstanding wedge-shaped member 58 which duing the upward movement of said finger from the position shown in Fig'. G to that shown in Fig. 1 is forced between the tail 59 of the starting lever 36 and the portion lever 48. The tail 59 of the starting lever prevented from lateral movement and thus the wedging action of the member 58 turns the lever 48 into the position shown in Fig. 2 and thereby disconnects the pulley 3" from the shaft 34. This action of the wedge 58 is illustrated in Figs. 9 and 12. 12 shows the wedge in its lowered position corresponding to Fig. 6 and as the lever 55 is moved upwardly into the position shown in Fig. 1 the wedge 58 crowds between the tail 59 and the part 60 and thus moves the part 69 to the left, Figs. 9 and 12. lll/'hen the starting lever 3G is depressed the tail 59 is swung out of engagement with the upstanding wedge 58 thus withdrawing the restraining force which holds the part GO in the position shown in Fig. 9 and allowing the lever 48 to swing so that the spring 47 can shift the pulley into clutching engagement with the shaft.

F ig. 10 illustrates the relative position of the part 60 and wedge member 58 after the starting lever has been actuated and Fig. 11 shows the relative position of the parts after the toggle has been straightened to close the clamps.

The parts are so designed that when the toggle lever 19, 17 is broken by the action of the lever arm 24 as shown in Fig. 6 the machine will be brought to rest with the main cam 22 in the position shown in Fig. 8 and .with the cutting cam 31 in the position relative to the tail 32 illustrated in Fig. 13 and in dotted lines in Fig. 1.

If it is desired to out the buttonhole after the stitching has been completed the lever arm 24 will be rendered inoperative for breaking the toggle, 17 19 and thus bringing the machine to rest and this operation of breaking the toggle will be delayed until after the cutting cam 31 has passed by the tail 32 of the cutting lever and thereby has actuated the cutter 280.

To accomplish this I have provided the following mechanism. 61 indicates a swing- GO of the f an arm 64 pivoted thereto at 65 and ysaid arm carries at its end a bunter 66. The pivotal connection between the arm 64 and the swinging member 61 permits the arm to be moved either into operative position shown in Fig. 2 or into inoperative position shown in Fig. 3. The arm 64 may be clamped in either position by a clamping screw 67 which extends through a slot 68 formed in the arm 64. When the arm 64 is in its operative position shown in Fig. 2 the bunter 66 overlies the end 53 of the lever arm 24 and holds said lever arm slightly depressed from its normal Vaosition, in which depressed position. the line of travel of the end of the lever arm is below the projection 54. Consequently when the lever arm is thus held depressedby the bunter 66 the end 53 of said lever arm will pass beneath the projection 54 during the final movement of the frame 2 by which the parts are carried from stitching to stopping position.y Consequently instead of the toggle 17, 19 being broken when the end 53 of the lever comes in line with the end of the projection 54 said toggle will remain straightened and, of course, the cam 22 will continue to be turned by the driving pulley 37. During such continued turning movement of the cam the cutting cam 31 engages the tail 32 of the cutting lever and actuates the latter, this occurring after the stitching has been completed. In other words, 'during this further movement the cam 22 is moved from the position shown in Fig. 8 to that shown in Fig. 7 and the cutting cam is moved from the dotted line to the full line position Fig. 1.

' As soon as the cutter has been actuated the toggle is then broken causing the pulley 37 Vto be unclutched from the shaft and the ma.-

cliine to be brought to rest. For accomplishing this I propose to employ means actuated by the turret-rotating means.

It will be understood by those familiar with sewing machines of this type that the turret is given a half rotation after one side of the buttonhole has been completed to sew around the end of the buttonhole and is given another half rotation at the end of the buttonhole, and that at some point between the finishing of the stitching on one buttonhole and thestarting ofthe stitching on the next buttonhole the turret is given a reverse rotation to bring it back to its initial position.

I propose to utilize the movement of the turret-rotating means. in giving the turret this reverse rotation to break the toggle 17,

19 and thus stop the machine with the cam in the position shown in Fig. 7 and after the buttonhole cutter has been actuated. The means for rotating the turret is that commonly employed in machines ofthis type and comprises a lever 69 pivoted to the cam casing at 70 and actuated by a groove in the cam 22, said lever being connected by a link 71 to an arm 72 fast on a vertical shaft 7 3, the latter having gear segments 74, 75 thereon which mesh with gears 76, 77 on the turret and on the needle bar carrier respectively. When the sewing is completed the turret-rotating mechanism is in the dotted line position Fig. 2 and after the sewing has been completed and while the parts are moving to stopping position said turret-rotating mechanism is moved into the full line position Fig. 2 thereby to give the turret a reverse rotation into its initial position. During this swinging movement of the arm 72 from the dotted to the full line position Fig. 2 it engages a projection 78 on the swinging member 61 and swings said member from the dotted to the full line position. During this swinging movement ofthe member 61 the bunter 66 engages the projection 54 as shown in F ig. 5 and breaks the toggle, 17, 19 thereby bringing .the machine Yto rest. This occurs directly after` the buttonhole cutter has been-actuated and when theV main cani is in the position shown in Fig. 7.

I'Yhen the buttonhole is to be cut before the sewing operation the bunter 66 is moved into inoperative position shown in Fig. 3. This is done by loosening the clampingfscrew 67 and swinging the arm 64 backwardly as far as the slot 68 will permit and then tightening the clamping screw. When in this position the bunter 66 is situated inside of the arm 53 and out of line laterally with the projection 54. When the arm 64 is thus in the inoperative position the device will operate as usual to out the buttonholey slit before the sewing operation begins.

Inasmuch as the main cam 22 is brought to rest in a different position when the cutting is to be done before the buttonhole stitching than it is when the cutting is to be done aftezi the buttonhole has been completed and inasmuch as it is necessary to straighten the toggle 17, 19 when the machine is set in operation, I have provided the cam 22 with two cam projections each adapted to actuate the lever arm 24. One ofAt-hese cam projections 28 has been referred to. The other is shown at 28a.

These two cam projections 28, 28a are so positioned that vone of them will bein the proper location to actua-te the lever arm 24 to straighten the toggle and thereby lower the clamps when the machine is set for cutting the buttonhole before the stitching operation, and the other cam projection will be so positioned that it will be operative to actuate the arm 24 and thus lower the clamps as the machine is started when the parts are adjusted for cutting the buttonhole after the stitcliin g operation.

The arm 24 will thus be lid' t depressed twice during each rotation of the cam 22 but only one of Vthese depressing movements will be operative, the other being an idle movement.

l claim:

l. In a lbuttonhole sewing machine, the combination with vstitch-forming mechanism, of a ybottonhole cutter, a. controlling cam which rotates once during Aeach buttonholeharming cycle, the Stich-forming mechanism being operated during a vpart of Veach rotation andthe cutter-being actuated during another part `otsaid rotation, and means to bring the cam to rest either just after the cutter is actuated for one buttonhole-forming cycle -or just 4before rit is actuated for the next succeeding buttonhole-forming cycle.

2. In a ,-buttonhole sewing machine, the combination with stitch-forming mechanism, of a buttonhole cutter, a main cam Which ro# tat-es once during eac'h 'buttonliole-forming cycle, the stitch-forming mechanism being operatedduring a. part of each rotation, a cuttersactuatingcamon they main cam, and means whereby said cam :may operate the `cutter either before or att-er the sticking operation.

In a button-hole sewing machine, the combination with stitch-forming mechanism, of rvrcarlr clamps, a buttonhole cutter, :.a main camavhich -rotates once dui-ino' each buttonliole-iorming cycle, @the stitch-forming mechanism 'be-ing operated during a part of each rotation., cutter-actuating cam 4on Ythe main cam, means vv'hereby said cam may operate the cutter either before or ai-tertl'ie .stitching operation, and means 'for closing the work clamps during the initial movement lof the r ma in cam.

Ll. In a. buttonhole vsewing machine, the

Y combination with stitch-forming mechanism,

of a 'buttonhole cutter, Work clamps, 'a toggle dict ,e for closing said clamps, :a main rcam which rotates once `during Aeach but-tonholeformingcycle, the stitch-forming mechanism being operated during apart of each rotation off-said cam and thai-cutter being actuated at a predetermined point in each rotation, means to release the work cl inps rand bring the :cam to rest `either just :aiter :the cutter is actuated in one buttonholediorming cycle or just before lit is actuated in the next buttonhole-formingfcycle, and means operative during the initial movement of the cam to close the clamps.

5. In a buttonhole sewing machine, the combination with Vstitch-orming mechanism, of a buttonhole cutter, a main cam which rotates once` during each buttonhole-forming cycle', a cam projection on the main cam by which the cutter is actuated, work clamps, Vmeans for closing' the Work clamps during the initial movement of the main cam, and means to release the clamps and bring the cam to rest either just before or just alter the cam yprojection actuates the cutter.

6.' In a buttonhole sewing machine, the 'combination with stitch-forming mecha-msm including a rotary turret, of a buttonholc cutter, work clamps, al main cam, means operated thereby to close the work clamps before the stitching operation and to actuate the cutter aiter the stitching operation, a swinging arm by which the turret is rotated, means actuated by the main cam to give sai-d arm its operative moven'ient, and means actuated by said arm to release vthe ivorl clam is after the buttonhole has been cut.

T. 1n a buttonhoe sewing machine, the combination with stitch-forming mechanism including a rotary turret, of Work-holding means including work clamps, said stitchforming mechanism and Work-holding means having a relative movement, a main cam by which the relative movement is produced and which makes one rotation during each buttonhole-forming cycle, a buttonhole cutter, means actuated by the main cam at a predeterniined point in each rotation to operate the cutter, truret-rotating means actuated by the main cam, means for releasing the clamps and bringing the cam to rest either by said relative movement between the stitch-forming mechanism and Work-holding means or by the turret-rotating means.

8. In a. buttonhole sewing machine, the con'rbination With stitch-forming mechanism including a rotary turret, oi Work-holding means including work clamps, said workholdi-ng means and stitch-forming mechanism having a relative movementa main cam for producing such relative movement, which main cam makes one rotation during' each buttonhole-forming cycle, a buttonhole cutter, means .actuated by the main cam at a predetermined point in its rotation to actuate said-cutter, means rendered operative by such relative movement to release the clamps ust before the main cam reaches its cutter-actuating position, other means actuated by the turretrotating means to release the work clamps just after Ythe main cam has reached cutter-actuating position, and means whereby either clamp-releasing means may be rendered Aoperative at vthe will of the operator.

9. In a buttonhole sewing machine, the combination with stitch-forming mechanism including a rotary turret, of Work-holding means including Work clamps, said Workf holding means and stitch-forming mechanism having a relative movement, a main cam for producing such relative movement, which main camfmakes one rotation during each buttonhole-forming cycle, a buttonhoie cutter, means actuated by the main cam at a predetermined point in its rotation to actuate said cutter, means rendered operative by such relative movement to bring `the cam 'to rest justbefore the main cam reaches its cutter- Ato rest just after the main cam has reachedL cutterfactuating position, and means wheneby either of the two last-named means may be rendered operative at the will of the operator.

l0. In a buttonhole sewing machine, the combination with stitch-forming mechanism including a rotary turret, of work-holding v a buttonhole cutter, a main cam which makes cutter, means actuated by the main cam at a` hole-forming cycle andl which produces said relative movement, means actuated by theV main cam at a predetermined point in its rotation to operate the cutter, turret-rotating means also operated by the main cam, means renderedV operative by said relative movement to break said toggle device just before the main cam reaches its buttonhole cutting position, other Vmeans actuated by the turretrotating means to break said toggle just after the cam reaches its buttonhole cutting position, and means to render either of said toggle-breaking means operative at'the will of the operator. i

1l. In a buttonhole sewing machine, the combination with stitch-forming mechanism includinga lrotary turret, of work-holding means including work clamps, said workholding means and stitch-forming mechanism having a krelative movement, a main cam for producing such relative movement,

i which main cam makes one rotation during each butonhole-forming cycle, a buttonhole predetermined point in its rotation to actuate said cutter, means rendered operative by such relative movement to bring the cam to rest just beforev the main cam reaches its cutter-actuating position, other means actuated by the turret-rotating means to bring the cam to' rest just after the main cam has reached cuter-actuating position, means whereby either of the two last-named means may be rendered operative at the will of the operator, and means actuated by the releasing of the clamps to bring the cam to rest.

l2. In a buttonhole sewing machine, the combination with stitch-forming mechanism including a rotary turret, of work-holding means including work clamps, a toggle device which when straightened closes the clamps. l and when broken opens the clamps, said stitch-forming mechanism and work-holding means having a relative movement, a buttonvhole cutter, a main cam which makes one completefrotationduring each buttonholeforming cycle and which producessaid relative movement, means actuated by the main `cam at a predetermined point in its rotation complete rotation during each Vbutton-- tobreak'saidtoggle device justV before the main cam'reaches its buttonhole cutting position, other means actuated by the turretrotating means to break said toggle just after the cam reaches lits buttonhole cutting position, means'to render either of said togglebreal-:ing lmeans 'operative at the will of the operator, and means actuated by the releasing of the clamps to `bring the cam to rest.

' 13. In a buttonhole sewing machine, the combination with stitch-forming mechanism, of buttonhole-cutting mechanism, a main cam vfor Vactuating the buttonhole-cutting mechanism and controlling the point inthe buttonhole-forming cycle at which the stitchforming mechanism is actuated, and'means to bring the machine lto rest with the cam either in a) position inrwhich it is about to actuate the buttonhole-cutting mechanism or has just actuated it. Y

14. In a buttonhole sewing machine, the combination with stitch-formingl mechanism, of buttonhole-cutting mechanism, work clamps, a main cam for actuating the buttonhole-cutting'mechanism and 'controlling the point in the bnttonhole-orming cycle at which the stitch-forming mechanism is actuated, means to bring the machine to rest with thecam either in a position in which it is about to actuate the buttonhole-cutting mechanismor has just actuated it, and means for invariablyA opening the worl;` clamps at a point in each buttonhole-forming cycle subsequent to both the stitching and buttonhole-cutting operations'.

l5. In a kbuttonhole sewing machine, the combination with stitch-'forming mechanism, of buttonhole-cutting mechanism, work clamps, agmain cam which rotatesonce during each buttonhole-forming cycle, the stitchforming mechanism being operated duri a part of each rotation, a cam projection on the main cam for actuating the buttonholecutting mechanism, means for causing said cam projection to operate the buttonholel? cutting mechanism either before or after the stitching operation, and means for-ensuring the opening of the worlr clamps during any buttonhole-forming cycle subsequent to both the stitching and buttonhole-cutting operal tions.

In testimony whereof, I have signed my name-to this specification. f I JOHN KIEVICZ, 

